I think you should be able to download the original archive. That is important as you don't really want to use the dds files as there is a loss in quality when the dds files are created.
The method below works for me, but I'm not sure if it's because I have developer access. Please let me know if this works:
- visit
https://www.lfs.net/files/vehmods
- find your mod there (maybe search by user name)
- click the mod to go to the mod's own screen
- look down at the bottom right, above "Disputes"
- do you see a blue button to get the original archive?
Then you should have the png files, although they have been renamed to unique names, so that isn't helpful but at least the full quality is there.